I |
Illinois
[M. x loebneri], cv. (cultivated as such
by several American institutions). = cv. Spring Snow.
Illinois No. 1
[M. x loebneri], cv. (J. C. McDaniel,
University of Illinois) = cv. Spring Snow.
Inodora
[M. liliiflora], var. (de Candolle) Pampanini,
Bull. Soc. Tosc. Ort.41: 140. (1916), leaves ovate, acuminate, glabrous; flowers
large, pale, inodorous, campanulate, globose; tepals 9, ovate, fleshy, apex
reflexed. basionym: M. inodora (de Candolle, Reg. Veg. Syst. 1: 459. 1817).
Iolanthe 
[M. campbellii, M. sargentiana (?), M.
x soulangeana], cv. (Magnolia 20(1) [Issue 37]: 17, 1984). ‘Similar
in size to ‘Mark Jury', but paler in color.’ Registered by Felix
M. Jury, Waitare, New Zealand. (M. X. soulangeana cv. Lennei x M. x cv. Mark
Jury (M. campbellii ssp. mollicomata x M. sargentiana var. robusta)).
Isca
[M. x veitchii], cv. (Robert Veitch &
Son, Exminster Nurseries, near Exeter, England, before 1950), in Roy. Hort.
Soc., Camellias & Magnolias Conf. Report, p. 102, FIG, 33 (1950), ‘has
flowers of approximately the same size as M. veitchii but they are whiter.’
it was named after the town of Isca in Exeter. Treseder’s Nurseries
Catalog, p. 8, circa 1965, Truro, Cornwall, England, ‘bears satiny-white
flowers along horizontal branches opening about a week earlier than the cv.
Veitchii Clone.
Iskia
[M. x veitchii], cv. (sic) Kruessmann,
Index Tremoniensis p. 76 (1970), Dortmund Botanic Garden, Germany) = cv. Isca.
Iufer 
[M. kobus, M. salicifolia], cv. (Magnolia
22(2) [Issue 42]: 11, 1986-7). ‘Small, Christmas tree-shaped plant,
covered with large white flowers with stamens tipped red. 15-20 feet tall
after 30 years.’ Introduced by Iufer Nursery, Salem, Oregon. Magnolia
21(2) [Issue 40]: 14, 1986. (M. salicifolia x M. kobus).
Iufers Form
[M. salicifolia], cv. (Otto Eisenhut
nursery catalog, p. 5, 1989, Ticino, Switzerland). ‘Large and profuse
flowers.’ = M. kobus x M. salicifolia cv. Iufer?
Ivory Chalice 
[M. acuminata, M. denudata], cv. (Magnolia
22(2) [Issue 42]: 11, 1986-7). ‘Blooms before leaf emergence. Nine tepals:
interior R.H.S. yellow 8D, exterior yellow-green 145A on exterior midribs
of outer tepals; gynoecium yellow-green 150B; anthers yellow 8C tipped with
narrow stripes of red-purple 62B. Corolla 16 CM. wide by 9.5 CM. long. Hardy
to at least -22 F.’ Registered by David Leach, 1894 Hubbard Road, Madison,
Ohio, 44057.
J
J. C. Williams
[M. sargentiana, M. sprengeri], cv. (Magnolia
33(1) [Issue 63]: 29, 1998). ‘This cross was made by Philip Tregunna
(head gardener at Caerhays from 1956 to 1996). The seed parent is a first-generation
seedling from original sargentiana ‘Robusta’ plants sent to Caerhays
from the Arnold Arboretum. The pollen parent was a ‘Diva’ seedling
growing at Caerhays. ‘J.C. Williams’ is similar to M. campbellii
var. mollicomata ‘Lanarth,’ but is subtly different in flower
color when the two trees are compared. It is named after J.C. Williams (1861–1939)
who founded and built the modern garden at Caerhays, purchased the original
‘Diva’ seedling at Caerhays, and was one of the first to flower
M. sargentiana ‘Robusta’ in the U.K. Registered in June, 1997
by F.J. Williams.’ = M. sargentiana cv Robusta x M. sprengeri cv Diva
seedling.
Janaki Ammal
[M. kobus], cv. (Callaway, Dorothy J.
The World of Magnolias, p. 157, 1994). ‘A colchicine-induced polyploid
form originating at the Royal Horticultural Society Garden at Wisley. Listed
in some accounts as a cultivar of Magnolia kobus var. stellata.’
Jane 
[M. liliiflora, M. stellata], cv. (Dudley
& Kosar, Morris Arb. Bull. 19: 27, fig. 3. 1968), late blooming, flowers
small, 3-4 in. in diameter, buds erect, slender, red-purple (RHS 71A-74D),
tepals 8-10, obovate-spatulate, 2-2 1/2 in. long, 1/2-1 in. wide, obtuse,
involute, purple (RHS 78B) grading to red-purple (RHS 73A-74D) or purple (75C-75D),
inside white (RHS 155D), stamens 90-110, red-purple (RHS 59B-59C-71B). A sterile
triploid. U.S. Natl. Arb. #28349. (M. liliiflora cv. Reflorescens x M. Stellata
cv. Waterlily).
Jane Platt 
[M. stellata], cv. (Gossler Farms Nursery
catalog, p. 7, 1984-85, Springfield, Oregon). ‘The flowers are lighter
pink than ‘Rosea’ but there are 20-30 tepals as compared to 8-12
of M. stellata ‘Rosea.’ We found this plant in the Portland garden
of Jane and John Platt.’
Japanese
[M. denudata], cv. (Treseder’s
Nurseries Catalog, p. 3, circa 1965, Truro, Cornwall, England) as cv. Japanese
Clone. ‘A selected form of this...species.’ synonym: cv. Wada's
Form.
Jennifer Robinson
[M. kobus var. loebneri] cv. (Magnolia 36(2) [Issue 70]: 17-18, 2001) This reliable-blooming, hardy tree produces flowers with a fragrance reminiscent of pansies (Viola sp.); flowers open flat with tepals that curve slightly upward; tepals 25 to as many as 32 are 6.1cm (2.4in) long and 2.5cm (0.98in) wide; flowers are white on the interior with a slight RHS 186C showing through from the reverse; outer tepals mainly white with RHS 186C midribs and some staining to white parts; overall effect from a distance is a very pale pink aging to white; gynoecium is green and androecium pale yellow with white anthers stained pink at the very base; original plant has a layered canopy and was 7.5m (24.6ft) tall and 5.5m (18ft) wide at time of registration; it has withstood -28C (-18.4F), but is likely hardier; raised and named by Capt. Richard M. Steele and registered in June 2001 by John Weagle; previously sold as 'Boulderwood Vigorous'
Jermyns
[M. salicifolia], cv. (Hilliers Man.
of Trees and Shrubs, Ed, 2, 1973). A slow-growing shrubby form, with broader
leaves conspicuously glaucous beneath and larger flowers appearing later.
one of the best flowering clones...’
Jersey Belle 
[M. wilsonii, M. sinensis], cv. (Magnolia
20(1) [Issue 37]: 17, 1984). ‘Originally received as a seed of M. sinensis.
Large flowers 6-8 inches across with 6 tepals. Violet Lort-Phillips, La Colline
Garden, Gorey, Jersey, Channel Islands, U.K. (International Dendrological
Society Journal, 1981).’
JG 16 
Joe McDaniel 
[M. x soulangeana, M. x veitchii(?)],
cv. (Magnolia 20(1) [Issue 37]: 17, 1984). ‘The darkest purple flower
of all the Gresham hybrids. The tulip shaped, deep purple buds open up as
well formed, bowl shaped flowers.’ Registered by Ken Durio, Opelousas,
Louisiana. Syn.: JMcD#6, LA#77, G66-3.
Joe McDaniel 2
[M. x soulangeana, M. x veitchii], cv.
(Otto Eisenhut Nursery Catalog, p. 2, 1989, Ticino, Switzerland). ‘Very
fine, huge pink.’ Syn.: cv Mary Nell, JMcD#2, LA#87, G66-1358.
John Bond
[M. cylindrica ?] cv. (Magnolia 36(2) [Issue 70]: 18, 2001) This tree, originating at Savill, produces pure white cup-and-saucer shaped flowers that are 22.9cm (9in) across; named and registered (May 2001) by Timothy Whiteley.
Joli Pompon 
Jolly Friar Tuck
[M. liliiflora], cv. (Newsl. Amer. Mag.
Soc. 12(1): 26-27. 1976). ‘Reddish purple outside and white inside,
its cheerful flowers are much larger than the solid purple selections seen
in this area [Grosse Pointe, Michigan] and have the typical scent of fresh-cut
watermelon.’
Jon Jon 
[M. x soulangeana, M. x veitchii(?)],
cv. (Otto Eisenhut Nursery Catalog, p. 2, 1989, Ticino, Switzerland). ‘JG
3.’ Nomen nudum. (Callaway, Dorothy J. The World of Magnolias, p. 219,
1994). ‘A late flowering Gresham Hybrid which flowers profusely. Tepals
deep reddish purple at base, becoming lighter toward the tip. Tepals 5.5 to
6 in. (14.0 to 15.2 cm) long. Selected and named by John Allen Smith, Magnolia
Nursery, Chunchula, Alabama, from hybrids of Todd Gresham planted at Gloster
Arboretum, Gloster, Mississippi.’ Syn: JG#3.
Josephine
[M. grandiflora], cv. Magnolia 22(2)
[Issue 42]: 11, 1986-7. ‘strongly upright, pyramidal tree bearing large
numbers of slightly smaller than usual flowers, borne over a long season.
indumentum dark reddish brown and dense.’ registered by Malcolm Manners,
the citr
Judy 
[M. liliiflora, M. stellata], cv. (Dudley
& Kosar, Morris Arb. Bull. 19: 28. 1968), midseason blooming, flowers
small, 2-3 in. in diameter, buds erect, red-purple (RHS 71A-70A), tepals keeled
and flaring, red-purple (RHS 7OB-70D), inside creamy-white (RHS 155A); stamens
40-50, red-purple (RHS 71A). A sterile triploid. U.S. Natl. Arb. #28345. (M.
liliiflora cv. Nigra x M. stellata).
Judy Zuk 
Julian Hill 
[M. macrophylla], cv. (Magnolia 20(1)
[Issue 37]: 17, 1984). ‘A highly fertile specimen, fully hardy to Zone
6. Leaves and flowers typical of the species.’ (Polly Hill, Vineyard
Haven, Massachusetts in Magnolia 18(2): 13-14, 1982).
Just Jean
[M. x soulangeana], cv. (John Gallagher,
Rhod. with Cam. & Mag. 41: 31. 1988). Nomen nudem. (Gardiner, J. M. Magnolias,
p. 125, 1989). ‘This floriferous hybrid resulted as a chance seedling
found by John Gallagher in Dorset, England, during the 1970s. It has a compact
habit and distinctive, large, obovate foliage. During the middle of April
it produces clear pink, goblet-shaped flowers flushed deep pink at the base.’